T2B17

Did you know that if you boil an egg first, it'll spin longer?

This was in a riddle, but technically, it's not a riddle, it's trivia, therefore, I am not presenting it as a riddle.

I actually didn't know this before, but it's quite interesting.

Here is the scientific explanation from Planet Science: 

Hard-boiled eggs are solid inside. In the raw egg, the liquid inside the egg slides about and stops the egg from spinning as fast.

When you stop the hard-boiled egg, it stops quickly. When you stop the raw egg, it keeps turning a little bit. You have only stopped the shell, not the liquid inside. The liquid is still moving, which causes the shell to keep turning.

Hard-boiled eggs will spin on their end if you spin them fast enough. The egg saves energy by spinning on its end and making a smaller circle.